Gas burner



United States Patent 3,269,666 GAS BURNER Gerrit de Leeuw, Leerdam, Netherlands, assiguor t0 N.V.

Vereenigde Glasfabrieken (United Glassworks), Shiedam, Netherlands, a limited-liability company Filed July 20, 1964, Ser. No. 383,873 Claims priority, application Netherlands, July 23, 1963, 295,682 2 Claims. (Cl. 239-545) The invention relates to a gas burner, which is provided with a plurality of gas canals, arranged in a row, especially a circular burner. Burners, of this type are well known in various constructions, especially for industrial use.

When a gas burner has to produce a great power, as occurs e.g. in the manufacture of glassware, the gas has to be supplied under high pressure. Consequently the flow velocity of the gas near the opening of the gas canal will obtain a high value. The limit in enlarging the output power is determined by the combustion rate of the gas. If, namely, the gas velocity will exceed the combustion rate, the flame will blow itself out.

In many cases, the output power can not be enlarged by enlarging the cross-dimensions of the gas canal, because thereby a greater flame will arise, whilst it may even be a demand that narrow flames are used in order to be able to concentrate the warmth in a very narrow area.

The principal object of the present invention is to obtain a burner construction for such cases, in which the indicated phenomenon of blowing off is avoided.

Another object of this invention is to obtain a burner which is especially suitable for operation on glass articles of high quality.

The present invention accomplishes these and other object by ponding near the outlet openings of the gas canals, a continuous cavity which is connected with the gas canals and which has a Width which is smaller and a length which is several times greater than the width of the gas canals.

The invention will be clarified in the course of the following description, which is to be read with reference to the accompanying drawing of an embodiment of a gas burner.

In the drawing:

FIGURE 1 is a central section through a part of a circular burner, as seen according to the arrows II of FIGURE 2, in the separation plane of the burner halves;

FIGURE 2 is a cross section according to the arrows II-II of FIGURE 1.

The circular burner which is represented in these figures, is used for heating glassware, especially for severing the so called moil of blown articles. The burner consists of two rings 1 and 2, between which a ring shaped canal 3 is saved, which serves for the supply of gas to the radial gas canals 4 which are saved in the lower ring 2 at regular distances along the whole inner circumference of the burner.

The connection between the ring canal 3 and the source of gas has not been represented, as it may be of usual c mstruction and is not influenced by the measures according to the invention. With 5 a cavity is indicated which has been turned out in the lower burner ring 2, and which is connected with the gas canals 4.

FIGURE 2 shows that the width of this cavity 5 is smaller than the width of the gas canals 4, by which the gas meets with a higher resistance. This resistance is further determined by the way a certain amount of gas will go in the cavity 5. By way of example some of these ways are indicated in FIG. 1 by arrows 6. The longer way will have a higher resistance. At high velocities of the gas which is streaming out through the canals 4, which velocities may exceed the combustion rate, at least one place can be found along the inner edge of the cavity where the gas velocity is lower than the combustion rate, because this gas has met with higher resistance. So at that place a small flame will keep burning, which subsequently will continuously light the gas streaming out immediately through the canals 4, and producing the big flames.

When the burner operates with earth gas, which has a lower combustion rate than coal gas, the resistance constituted by the cavity has to be pretty great. Experimentally it appears that a circular burner, as represented in the drawing and having an inner diameter of 400 mm., a width of the gas canal 4 of 0.6 mm. and a height of gas canal 4 of 0.2 mm. gas is used, meets the requirements when the width of the cavity is made 0.08 mm., so smaller than half the width of the gas canals 4, the depth (size in radial direction) of the cavity 5 for attaining a suflicient long way amounting to 5 mm., so more than three times the width of the gas canals 4.

Heretofore the minimum thickness of the flames produced was limited by the combustion rate of the gas mixture used, in view of the fact that for a certain purpose a certain minimum heat capacity is required, as has been shown, according to the invention.

The gas velocity may be increased, which means that for a certain gas mixture the dimensions of the gas canals may be reduced, simply compensated by a higher gas velocity for the same power. This means that thinner flames can be produced, which has a very favourable effect on the article treated, e.g. on the edge of a glass article often the moil.

Obviously the invention is susceptible to some change or alteration without defeating its practicability and I therefore do not wish to be confined to the preferred embodiment shown in the drawings and described herein, further then I am limited by the scope of the appended claims.

What I claim is:

1. A gas burner, which is provided with a plurality of gas canals, arranged in a row, and having connection with a main gas supply especially a circular burner, which burner has a continuous cavity, which is connected with the gas canals near the outlet opening of these gas canals, the said cavity having a width which is smaller and a length which is several times greater than the Width of the gas canals.

2. A gas burner, which is provided with a plurality of gas canals, arranged in a row, having connection with a main gas supply especially a circular burner, which burner has a continuous cavity, which is connected with the gas canals near the outlet opening of these gas canals, the said cavity having a width which is less than half the gas canal width, the depth of the cavity being at least three times the gas canal width.

No references cited.

EVERETT W. KIRBY, Primary Examiner. 

1. A GAS BURNER, WHICH IS PROVIDED WITH A PLURALITY OF GAS CANALS, ARRANGED IN A ROW, AND HAVING CONNECTION WITH A MAIN GAS SUPPLY ESPECIALLY A CIRCULAR BURNER, WHICH BURNER HAS A CONTINUOUS CAVITY, WHICH IS CONNECTED WITH THE GAS CANALS NEAR THE OUTLET OPENING OF THESE GAS CANALS, THE SAID CAVITY HAVING A WIDTH WHICH IS SMALLER AND A LENGTH WHICH IS SEVERAL TIMES GREATER THAN THE WIDTH OF THE GAS CANALS. 